에러현상
RuntimeError: You called this URL via POST, but the URL doesn't end in a slash and you have APPEND_SLASH set. Django can't redirect to the slash URL while maintaining POST data. Change your form to point to 127.0.0.1:8000/account/signup/ (note the trailing slash), or set APPEND_SLASH=False in your Django settings.
변경전
<form method="post" action="/account/signup">변경후
<form method="post" action="/account/signup/">
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